Question

初二几道分式约分题

①a^2-b^2/a-b②x+y/x^2+xy③m^2-16/3m-12④a^2-6a+9/a^2-9⑤4b^2-a^2⑥-4x^2y⑦2(x-y)^2/6(y-x)^3⑧a^2-4a+4/a^2-4⑨x^2-2xy
+y^2/ax-ay ⑩2a^2+2ab/3ab+3b^2.就是这些题，求高人解答，哪道题表达不清问我。

Answer 1

①a^2-b^2/a-b=-(a-b)(a+b)/(a-b)=-a-b

②x+y/x^2+xy=(x+y)/x(x+y)=1/x

③m^2-16/3m-12=(m-4)(m+4)/3(m-4)=(m+4)/3

④a^2-6a+9/a^2-9=(a-3)²/(a-3)(a+3)=(a-3)/(a+3)

⑤4b^2-a^2=(2a-a)(2b+a)
⑥-4x^2y=?

(⑦2(x-y)^2/6(y-x)^3=2(y-x)²/6(y-x)³=1/(3y-3x)

⑧a^2-4a+4/a^2-4==(a-2)²/(a-2)(a+2)=(a-2)/(a+2)

⑨x^2-2xy+y^2/ax-ay=(x-y)²/a(x-y0=(x-y)/a

⑩2a^2+2ab/3ab+3b^2.=2a(a+b)/3b(a+b)=2a/3b

5题,6题题目有问题